Which is an example of an algebraic expression A.4(3+8)
B.18^2
C. 3-a
D. 12•4

C: 3-a

Step-by-step explanation:

The answer is C because an algebraic expression needs to have a variable in it. The variable is "a," so the answer has to be C.

Option C : as in algebraic expression there must a variable and constant.

a - base

b - exponent

so,

answer: two angles are called supplementary if they add up to 180°. example: the two angles (140° and 40°) are supplementary because they add up to 180°.

step-by-step explanation: